Discrete Alarms - DPS Telecom NetGuardian 216 User Manual

10
Discretes 1–16
B* A*
ALM 1 1 26
2 27
ALM 2
ALM 3 3 28
ALM 4 4 29
5 30
ALM 5
6 31
ALM 6
7 32
ALM 7
8 33
ALM 8
9 34
ALM 9
ALM
10 35
10
ALM
11 36
11
ALM
12 37
12
ALM
13 38
13
* The polarity of alarm point A is negative and alarm point B is positive.
** NO=Normally Open, NC=Normally Connected, CO=Common
*** A contact closure will occur when the fuse is blown.

4.7.1 Discrete Alarms

Fig. 4.10 Discrete alarm points can connect as a dry contact or a contact to ground
The NetGuardian 216 supports up to 16 discrete alarm inputs. Discrete alarms are typically used to monitor door
alarms, power outages, equipment failures, and other on/off conditions.
Discrete alarm points connected to the NetGuardian are single-lead signals referenced to ground. The B side of
B* A*
ALM
14 39 Relay 1
14
ALM
15 40
Relay 2
15
ALM
16 41
16
25 50
GND
Table 4.A Alarm point polarity descriptions
Relays**
NC NO CO
42 17 43
44 19 18
Fuse
20 45
Alarm***
Analogs 1–2
+ – +
Analog A B 23 48
1
Analog
A B 24 49
2
–